Installing SMTP Service

Microsoft SMTP Service installed along with the IIS. System requirements for Microsoft SMTP Service are identical to those for IIS.
Starting, Pausing and Stopping SMTP Service

You can stop and start SMTP Service manually. However, while it is an operation, you must be careful when stopping, pausing, and restarting the service, so users are not affected.

All IIS computers on an organization's network can be stopped, paused, and restarted remotely from any computer on which Internet Service Manager (ISM) installed.

To administer a service remotely, the user running ISM must be defined in the Windows NT Server Administrators group on the computer to administer.

Changing the Default Startup Setting

You can modify the default startup setting using the Services application in Control Panel.

To modify the default startup setting

Open Control Panel and select Services.

Under Service, select Microsoft SMTP Service, and then click Startup

Under Startup, choose Automatic. Manual, or Disabled.

Manually Starting SMTP Service

If you have set the default startup setting to Manual, you can use ISM to start Microsoft SMTP Service.
To start the SMTP service manually

In the ISM window, expand the SMTP tree structure.

Select the default SMTP server.

From the Action menu, choose Start.

Manually Pausing Microsoft SMTP Service

You can pause Microsoft SMTP Service for updates and maintenance. Pausing prevents new client connections but enables Microsoft SMTP Service to continue processing existing client connections and deliver queued mail. Messages with the .eml extension cannot be deleted from the Queue directory while the service paused.